# Eva Cycle : Period Tracker — Private Period Tracker

> Private Period Tracker (iPhone/iPad app by nguyen van sang.)

- Source: https://appshunter.io/ios/app/eva-cycle-period-tracker/id6798671793 (this page in markdown: same URL + `.md`)
- Developer: [nguyen van sang](https://appshunter.io/developer/1575122979)
- Category: Health & Fitness
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 15.0 · 22 MB
- Languages: American English
- Released: 2026-08-25
- Data updated: 2026-09-14
- User reviews in markdown: https://appshunter.io/ios/app/eva-cycle-period-tracker/id6798671793/reviews.md

## What is Eva Cycle?

Eva Cycle is the privacy-first menstrual cycle tracker that keeps everything on your device — forever.

  No accounts. No cloud. No data collection. Your most personal health data stays exactly where it belongs: with you.

  SMART PREDICTIONS
  Eva Cycle uses a Bayesian statistical algorithm that learns from your own cycle history to predict:
  • Your next period start date (with confidence intervals)
  • Your estimated ovulation window
  • Daily conception probability

  The more you log, the smarter and more personalised your predictions become.

  DAILY LOGGING
  Track everything that matters to you:
  • Menstrual flow intensity (light, medium, heavy)
  • Mood (happy, calm, energetic, sad, irritable, anxious, tired)
  • Cervical mucus observations
  • Basal body temperature (BBT)
  • Pain levels
  • Intercourse & protection status
  • Free-form notes

  COMPLETE PRIVACY & SECURITY
  Eva Cycle was built from the ground up with privacy as the core feature — not an afterthought:

  • 100% offline — zero internet or server communication, ever
  • AES-256 encryption (SQLCipher) protects all your data on device
  • Biometric lock (Face ID / fingerprint) secures app access
  • One-tap emergency data wipe removes everything instantly
  • Encrypted backups with your own passphrase — we never see your key
  • No analytics, no tracking, no ads

  CALENDAR & HISTORY
  • Monthly and weekly calendar views
  • Full cycle history with statistics
  • See patterns and trends over time

  BACKED UP ON YOUR TERMS
  Export an encrypted backup file to your own storage at any time. Restore it on the same device or a new one using only your passphrase — no account required.

  ONE-TIME PURCHASE
  Eva Cycle is free to try for one full year. After that, a single one-time purchase unlocks Eva Cycle Premium permanently — no recurring subscription, ever.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Eva Cycle Forever | $4.99 | one-time |



## Version history (last 1 release)

### 1.0 — 2026-08-25

No release notes.

## More apps by nguyen van sang

- [FliesFly](https://appshunter.io/ios/app/fliesfly/id1575122977)
- [Neon Cube Rush](https://appshunter.io/ios/app/neon-cube-rush/id6796860355)
- [Ledjo](https://appshunter.io/ios/app/ledjo/id6797702877)
- [MathChirp - AI Math practice](https://appshunter.io/ios/app/mathchirp-ai-math-practice/id6799354516)
- [Afterward — Daily Planner](https://appshunter.io/ios/app/afterward-daily-planner/id6799552792)

All apps by nguyen van sang: https://appshunter.io/developer/1575122979

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-09-14.*